Just the bulbs or housings too?
Bulbs - eBay. I don't car what anyone says. They last long enough and they work just fine. Although I would recommend getting HIDs
I got mine for like $55 shipped on eBay with the ballasts and wiring and everything. Took me about 15 mins to get them all set up and they look awesome. I have a light blue tint on my headlights and a rally yellow for the fogs.
Housings - try to go with JDM one piece headlights. If you are willing to spend the extra buck get the ones that are just plain old one piece. I got the black housings but now I regret it!